US7753823B2 - Systems and methods for brake regulation of motor vehicles - Google Patents
Systems and methods for brake regulation of motor vehicles Download PDFInfo
- Publication number
- US7753823B2 US7753823B2 US11/699,491 US69949107A US7753823B2 US 7753823 B2 US7753823 B2 US 7753823B2 US 69949107 A US69949107 A US 69949107A US 7753823 B2 US7753823 B2 US 7753823B2
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- United States
- Prior art keywords
- function
- drive torque
- parking brake
- automatic
- standstill
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
Definitions
- the present invention relates to brake regulating systems and methods for motor vehicles having an electronic control unit, by which an automatic parking brake function is activatable at a standstill of the motor vehicle, deactivation of which is performed as a function of the instantaneous drive torque.
- braking force is maintained or actively built up on at least one wheel of the vehicle dependently or independently of the dimension of the pedal actuation or another actuating element.
- Various entry and/or trigger conditions are provided jointly, or alternatively, for the activation and deactivation of the function.
- automatic parking brake functions are known, for example, under the names starting assistant, hill assistant, hill holder, or automatic hold. In summary, these methods are referred to in the following as automatic parking brake functions. All of these automatic parking brake functions share the feature, for example, of a hydraulic, mechanical, electrohydraulic, electromechanical, pneumatic, or electronically controllable brake system. By using the controllable braking system, the vehicle is stopped and is prevented from rolling. Methods are also known in which rolling of the vehicle is prevented via the transmission (in particular, such as automatic transmissions). In all of these functions, for example, the function is activated by actuating the brake pedal or the hand brake, or via switching elements connected thereto, and/or also other actuating elements (such as switches, buttons, etc.). Deactivation is performed via the same or also other measures (such as gas pedal setting, clutch signal, drive torque signals of the engine, etc., and also after passage of a defined retention time).
- control signals, or switching devices for implementing the functions are, for example, usually one or more velocity signals for detecting the vehicle standstill, mechanical, pneumatic, or hydraulic actuators (electrohydraulic, electropneumatic, or electrical actuators are also contemplated, in principle) in the wheel brakes and/or in the supply lines to the wheel brakes, via which the brake action may be built up and reduced, and/or at least temporarily maintained (e.g., control/regulating valves integrated in the form of an existing control or regulating unit, such as ABS, ASC/ASR, DSC/ESP/EHB systems), possibly also longitudinal acceleration or inclination sensors.
- actuators electrohydraulic, electropneumatic, or electrical actuators are also contemplated, in principle
- control/regulating valves integrated in the form of an existing control or regulating unit such as ABS, ASC/ASR, DSC/ESP/EHB systems
- the roadway longitudinal inclination may be ascertained and the braking force necessary for a secure standstill of the vehicle and the starting torque required for the roadway inclination may be determined and one or more pressure sensors, with the aid of which the brake pressure and/or the applied braking torque on the wheel brakes(s), may be ascertained.
- An aspect of the present invention is to disengage the braking torque as necessary, and precisely, in a targeted manner at a sufficiently high starting torque so that the vehicle does not roll in an undesired way prematurely against the desired travel direction, thus possibly causing accident situations. Additionally, the vehicle does not have to start up against the brake retaining force and thus reductions in comfort, which may otherwise arise due to too long a braking force retention (caused by a requested starting torque, which is too high) can be minimized.
- the present invention thus provides a brake regulating system for motor vehicles having an electronic control unit, by which an automatic parking brake function is activatable at a standstill of the motor vehicle, deactivation of which is performed as a function of the instantaneous drive torque.
- an activated parking brake function a deactivation of the parking brake function may be suppressed if, on the basis of a function executed at a standstill of the motor vehicle, an automatic increase of the drive torque, which does not result from a starting command of the driver, is necessary.
- FIG. 1 is a flow chart illustrating the method for brake regulation of a motor vehicle according to the present invention.
- the present invention is based on the following recognitions:
- the problem may arise that due to an “automatic” increase of the engine torque (i.e., not predefined directly by the driver via accelerator pedal preset), or more generally the drive torque, a premature startup command is detected and the braking torque (and/or braking force or brake pressure) is then automatically reduced by the system.
- the vehicle is thus no longer sufficiently fixed on the slope and may start to roll too early unintentionally, which may, at a minimum, result in a reduction in comfort.
- actuation of the steering (steering movements) by the driver possibly also due to a steering system (e.g., AFS, EPS), but also, for example, due to the air-conditioning system (start up/shut down of air-conditioning compressor), the start up of the (electric) motor fan, the start up and shut down of other mechanical, electromechanical, electrical, pneumatic, or hydraulic consumers in the vehicle (e.g., transmission torque changes by connecting/disconnecting converter lockup clutches, etc.), i.e., in general due to internal vehicle consumers (loads) and systems and/or components which require a consumption torque (e.g., friction torque, drag torque) from the drive engine, the engine control/regulation and/or its idle regulator must first be settled out.
- brief oscillations and/or exaggerations of the delivered drive torque arise due to the settling procedure of the engine controller
- the required setpoint drive torque (as a base drive torque condition), which is usually at least variable as a function of slope, may accordingly be fixed higher in general to deactivate the parking brake function by corresponding adaptation/application of the automatic parking brake function and/or oscillating influences may be damped by chronological filtering of the drive torque signal, so that automatic drive torque changes as described above during the retention phase do not result in the erroneous detection of the starting command described.
- this in turn has the disadvantage that in the event of a “real” starting command via accelerator pedal preset, a braking torque disengagement of the automatic parking brake function, which is significantly too late, occurs. The impression will thus always arise, when starting, of at least briefly starting against the brakes, which would be connected to significant comfort disadvantages and quality complaints.
- a general case differentiation in an automatic parking brake function between the above-mentioned undesired drive torque increases and the drive torque increase as a result of “starting command via accelerator pedal” is generally forbidden since the automatic parking brake function is frequently defined in such a way that a comfortable start (i.e., the timely disengagement of the braking torque) without rolling against the desired travel direction must also be possible solely by applying the idle torque (and/or creep torque), without the driver actuating the gas pedal.
- the present invention provides a brake regulating system and method for motor vehicles having an electronic control unit, by which an automatic parking brake function is activatable in a standstill mode of the motor vehicle (retention phase), whose deactivation is performed as a function of the instantaneous drive torque, is implemented in such a way that when the parking brake function is activated, a deactivation of the parking brake function may be suppressed if, because of a function executed at a standstill of the motor vehicle, an automatic increase of the drive torque, which does not result from a starting command of the driver, is necessary.
- a flow chart illustrates an embodiment of the present invention, wherein when a vehicle is at standstill or nearly standstill—and if necessary further conditions are fulfilled (e.g. brake pedal activated)—(step 10 ) and the automatic parking brake function is activated (step 12 ), the instantaneous drive torque is monitored (step 14 ).
- the method determines whether there is an automatic increase of drive torque (step 16 ). If not, then the method determines whether the instantaneous drive torque exceeds a predetermined drive torque (step 18 ). If not, then the method continues to monitor the instantaneous drive torque (step 14 ).
- step 16 determines whether the automatic increase of drive torque exceeds a threshold that impairs vehicle retention (step 22 ). If not, then the process returns to the step of determining whether the instantaneous drive torque exceeds a predetermined drive torque (step 18 ). However, if the automatic increase in drive torque does exceed the threshold impairing the vehicle retention (step 22 ), then the method operates to increase the predetermined drive torque (step 24 ), at which point the method continues to determine whether the instantaneous drive torque exceeds the predetermined drive torque (step 18 ). Should the instantaneous drive torque exceed the predetermined drive torque (step 18 ), then the automatic parking brake function is deactivated (step 20 ).
- the value or the gradient may be provided to the control unit via this automatic drive torque increase itself.
- state changes of internal vehicle consumers which may cause an increase of the drive torque, may be monitored to detect an automatic increase of the drive torque.
- a corresponding absolute value, relative value, and/or a corresponding gradient value of the drive torque increase may be concluded as a function of a state change of a consumer.
- a base drive torque condition which must be fulfilled to deactivate the automatic parking brake function, may be the corrected.
- the base drive torque condition may be the exceeding of a first absolute and/or relative threshold value and/or of a first gradient threshold value.
- the braking torque required for activating the automatic parking brake function for the retention phase may be compared to the drive torque.
- the braking torque may be increased if the automatic increase of the drive torque exceeds a defined second absolute and/or relative threshold value and/or a defined second gradient threshold value in such a way that secure retention of the motor vehicle at a standstill may not be ensured.
- An exemplary embodiment is described on the basis of a correction of the base drive torque condition during an activated parking brake function (e.g., “hill holder retention phase”) in the event of steering actions.
- an activated parking brake function e.g., “hill holder retention phase”
- the base drive torque condition may be adapted, for example, in such a way that during the hill holder retention phase, a correction as a function of the above-mentioned variables is performed continuously:
- an available signal which describes the steering movements and/or steering torque sufficiently precisely in another way (e.g., steering pump pressure and/or pressure in the hydraulic steering lines; steering torque which is output by signal transmission (e.g., CAN) from a steering control unit (e.g., AFS, EPS) and is available to the hill holder functionality), and/or upon exceeding/falling below a defined threshold, and/or
- an activation/deactivation signal e.g., CAN activation message, activation bit, switching signal, etc.
- a correction may, for example, be performed using the above-mentioned variables of steering angle and/or steering angular velocity or also steering pressure level in that a constant (torque) offset derived therefrom is added to or subtracted from the drive torque value relevant for the hill holder function as a fixed value and/or a variable value from a mathematical-functional dependence thereon (e.g., proportional connection via characteristic line, linear or curved).
- a multiplicative correction or correction according to another defined functional dependence would also be possible.
- Corrections of the hill holder drive torque corresponding to the exemplary embodiment may also be performed analogously for further possible influencing variables.
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Claims (5)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006004258 | 2006-01-31 | ||
DE102006004258A DE102006004258A1 (en) | 2006-01-31 | 2006-01-31 | Braking installation for motor vehicle with electric controls whereby deactivation of locking brake function can be suppressed if drive moment increases because of function needed not due to driver's driving intent |
DE102006004258.1 | 2006-01-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070179020A1 US20070179020A1 (en) | 2007-08-02 |
US7753823B2 true US7753823B2 (en) | 2010-07-13 |
Family
ID=38268192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/699,491 Active 2028-07-25 US7753823B2 (en) | 2006-01-31 | 2007-01-30 | Systems and methods for brake regulation of motor vehicles |
Country Status (2)
Country | Link |
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US (1) | US7753823B2 (en) |
DE (1) | DE102006004258A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007015123A1 (en) | 2007-03-29 | 2008-10-02 | Bayerische Motoren Werke Aktiengesellschaft | Brake regulation system for motor vehicles, has brake control unit, which is formed such that drive moment threshold is increased in case of re-start carried out manually or automatically during activation of parking brake function |
JP2009113712A (en) * | 2007-11-08 | 2009-05-28 | Advics Co Ltd | Vehicular braking force control device |
JP5360297B2 (en) * | 2010-06-02 | 2013-12-04 | トヨタ自動車株式会社 | VEHICLE CONTROL DEVICE AND VEHICLE CONTROL METHOD |
DE102013214764B4 (en) * | 2013-07-29 | 2020-03-19 | Bayerische Motoren Werke Aktiengesellschaft | Carrying out a change of direction in a parking assistance system with longitudinal and lateral guidance |
DE102018212064A1 (en) | 2018-07-19 | 2020-01-23 | Robert Bosch Gmbh | Method for driver assistance, in which a vehicle automatically executes a driving maneuver, and control and regulating device for a braking device of a vehicle |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19611359C1 (en) | 1996-03-22 | 1997-08-28 | Daimler Benz Ag | Method for preventing a vehicle from accidentally rolling away |
DE19941482A1 (en) | 1998-09-30 | 2000-04-06 | Bosch Gmbh Robert | System for preventing backward rolling of vehicle on slope with brake system using actuators for distributing braking effort using two facilities to adjust difference between F and R wheel |
DE19848448A1 (en) | 1998-10-21 | 2000-05-04 | Daimler Chrysler Ag | Brake pressure controller for road vehicle braking system initiates time interval in which driver can change state of brake pressure demand from actuation activity detected as driver demand |
DE19950034A1 (en) | 1999-10-16 | 2001-04-19 | Bosch Gmbh Robert | Controlling vehicle braking system for anti-roll-back or hill-holding, employs simple hardwired combinatorial logic circuitry responding with delays where appropriate |
DE19950162A1 (en) | 1999-10-19 | 2001-05-10 | Daimler Chrysler Ag | Anti-roll back system used during start-off of vehicle senses degree of brake pedal operation indirectly, conditionally applying and releasing control pressure for smooth start |
DE10151846A1 (en) | 2000-10-24 | 2002-05-23 | Daimler Chrysler Ag | Preventing unintentional rolling away of stationary vehicle involves automatically deactivating parking mode by further operation of brake pedal or by operating gas pedal |
US20030033073A1 (en) * | 2001-07-25 | 2003-02-13 | Honda Giken Kogyo Kabushiki Kaisha | Vehicle brake control system |
US20060079377A1 (en) * | 2002-12-30 | 2006-04-13 | Volvo Lastvagnar Ab | Method and device for hill start |
US7231994B2 (en) * | 2003-11-24 | 2007-06-19 | Daimlerchrysler Corporation | Hybrid vehicle with integral generator for auxiliary loads |
US20080026913A1 (en) * | 2006-07-27 | 2008-01-31 | Takehiro Nakamoto | Braking system for golf car |
-
2006
- 2006-01-31 DE DE102006004258A patent/DE102006004258A1/en active Pending
-
2007
- 2007-01-30 US US11/699,491 patent/US7753823B2/en active Active
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19611359C1 (en) | 1996-03-22 | 1997-08-28 | Daimler Benz Ag | Method for preventing a vehicle from accidentally rolling away |
US5979619A (en) | 1996-03-22 | 1999-11-09 | Daimlerchrysler Ag | Method and system for preventing unwanted rolling away of a vehicle |
DE19941482A1 (en) | 1998-09-30 | 2000-04-06 | Bosch Gmbh Robert | System for preventing backward rolling of vehicle on slope with brake system using actuators for distributing braking effort using two facilities to adjust difference between F and R wheel |
US6814414B1 (en) | 1998-09-30 | 2004-11-09 | Robert Bosch Gmbh | Device and method for preventing rollback of a vehicle on an incline |
US6315372B1 (en) | 1998-10-21 | 2001-11-13 | Daimlerchrysler Ag | Brake pressure control device for a brake system of a road vehicle |
DE19848448A1 (en) | 1998-10-21 | 2000-05-04 | Daimler Chrysler Ag | Brake pressure controller for road vehicle braking system initiates time interval in which driver can change state of brake pressure demand from actuation activity detected as driver demand |
DE19950034A1 (en) | 1999-10-16 | 2001-04-19 | Bosch Gmbh Robert | Controlling vehicle braking system for anti-roll-back or hill-holding, employs simple hardwired combinatorial logic circuitry responding with delays where appropriate |
US6439675B1 (en) | 1999-10-16 | 2002-08-27 | Robert Bosch Gmbh | Method and device for controlling a braking system |
DE19950162A1 (en) | 1999-10-19 | 2001-05-10 | Daimler Chrysler Ag | Anti-roll back system used during start-off of vehicle senses degree of brake pedal operation indirectly, conditionally applying and releasing control pressure for smooth start |
DE10151846A1 (en) | 2000-10-24 | 2002-05-23 | Daimler Chrysler Ag | Preventing unintentional rolling away of stationary vehicle involves automatically deactivating parking mode by further operation of brake pedal or by operating gas pedal |
US20030033073A1 (en) * | 2001-07-25 | 2003-02-13 | Honda Giken Kogyo Kabushiki Kaisha | Vehicle brake control system |
US20060079377A1 (en) * | 2002-12-30 | 2006-04-13 | Volvo Lastvagnar Ab | Method and device for hill start |
US7231994B2 (en) * | 2003-11-24 | 2007-06-19 | Daimlerchrysler Corporation | Hybrid vehicle with integral generator for auxiliary loads |
US20080026913A1 (en) * | 2006-07-27 | 2008-01-31 | Takehiro Nakamoto | Braking system for golf car |
Non-Patent Citations (1)
Title |
---|
German Search Report dated Aug. 29, 2006 with English translation of pertinent portions (Nine (9) pages). |
Also Published As
Publication number | Publication date |
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US20070179020A1 (en) | 2007-08-02 |
DE102006004258A1 (en) | 2007-08-02 |
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